Some are definitely better than others. I say this because one of my bikes has the worst set - I think it's because the arms are thin and flex when the brakes are applied. The other bikes have better, stiffer brakes.

I'm afraid I can't reccommend any particular make, though, except to say, don't buy the cheapest - they'll be cheap for a reason, as I've discovered.

Also: do not fit cantis in front if you have front suspension. A mistake which, so I've heard, used to be seen even in off-the-shelf bikes, though I think most dealers are wise to it now! Problem is obvious when you think about it: as the sus works up and down the cable will tighten and slacken, making the brakes open and close when you least expect it!